Re: Worried I've eaten a Death Cap Mushroom by mistake.
I'm a relative newcomer to HA, before turning 50 I'd never had a single episode. Since then I've had obsessions over heart disease, skin and prostate cancer. None of which came to anything. So I may not be the best person to be commenting Indeedbeak.
However, if we weigh up the likelihood of your symptoms being caused by anxiety or poisoning by death cap, the most likely and by some distance most logical explanation would be anxiety. Suggestion is extremely powerful, and an anxious mind will do just that. Suggest. I had exactly the same in 2018. I was convinced I had congestive heart disease and I read on our 'oh so reliable' Dr Google that extreme exhaustion was a symptom.
So the next morning I was in Asda and had to leave my trolley and return to the car, because I felt so tired I was afraid I might not get home. And yet it turned out my heart was fine as hospital tests showed. In a way with HA we put the cart in front of the horse. That's what happened regarding my heart and the same is happening with you now Indeedbeak. Both nausea and diarrhea can and often are caused by anxiety. HA is hell and please don't think I'm dismissing your fears, but this is anxiety at work.
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'It was a wedding ring, destined to be found in a cheap hotel, lost in a kitchen sink, or thrown in a wishing well' - Marillion, Clutching at Straws, 1987